​Lucy invested $10,000 at the rate of 12%.According to the rule of 72,it would take ______ years for her money to double

A) ​4
B) 5
C) 6
D) ​7

Which of the following periods was not characterized by inflation in the U.S.economic history?

A) 1917-1920
B) 1929-1933
C) 1947
D) 1978-1980
E) 1980-1989